Zhao Zhi-Jun, Wang De-Hua
State Key Laboratory of Integrated Management for Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, 25 Beisihuan Xilu, Zhongguancun, Haidian, Beijing 100080, China.
Physiol Behav. 2005 Jun 2;85(2):143-9. doi: 10.1016/j.physbeh.2005.03.014.
Environmental cues play important roles in the regulation of an animal's physiology and behavior. In the present study, we examined the effects of short photoperiod (SD) on body weight as well as on several physiological, hormonal, and biochemical measures indicative of thermogenic capacity to test our hypothesis that short photoperiod stimulates increases in thermogenesis without cold stress in Brandt's voles. SD voles showed increases in basal metabolic rate (BMR) and nonshivering thermogenesis (NST) during the 4-week photoperiod acclimation. At the end, these voles (SD) had lower body weights, higher levels of cytochrome C oxidase (COX) activity and mitochondrial uncoupling protein-1 (UCP1) contents in brown adipose tissues (BAT), and higher concentrations of serum tri-iodothyronine (T3) and thyroxine (T4) compared to LD voles. No differences were found between male and female voles in any of the above-mentioned measurements. Together, these data indicate that SD experience enhances thermogenic capacity similarly in males and females of Brandt's voles.
环境线索在动物生理和行为的调节中起着重要作用。在本研究中，我们研究了短光照周期（SD）对体重以及几种指示产热能力的生理、激素和生化指标的影响，以检验我们的假设：短光照周期在布氏田鼠中能在无冷应激的情况下刺激产热增加。在为期4周的光照周期适应过程中，SD组田鼠的基础代谢率（BMR）和非颤抖性产热（NST）增加。最后，与长光照周期（LD）组田鼠相比，这些（SD组）田鼠体重更低，棕色脂肪组织（BAT）中的细胞色素C氧化酶（COX）活性和线粒体解偶联蛋白-1（UCP1）含量更高，血清三碘甲状腺原氨酸（T3）和甲状腺素（T4）浓度更高。在上述任何测量中，雄性和雌性田鼠之间均未发现差异。总之，这些数据表明，SD经历对布氏田鼠的雄性和雌性产热能力的增强作用相似。
